-74.96% is the change from 663 to 166
Calculation steps:
[( 166 - 663 ) ÷ 663] x 100 = -74.96%
Formula
Percentage change = [(166 - 663) / 663] x 100
Subtract the new number by the original number
166 - 663 = -497
-497 ÷ 663 = -0.7496229260935143
-0.7496229260935143 x 100 = -74.96%